client.ts

// The Interpreter Pattern Use Case Example
import IAbstractExpression from "./iabstract-expression"
import Parser from './sentence-parser'

// The sentence complies with a simple grammar of
// Number -> Operator -> Number -> etc,
const SENTENCE = '5 + IV - 3 + VII - 2'
// const SENTENCE = "4 + II + XII + 1 + 2"
// const SENTENCE = "5 + 4 - 3 + 7 - 2"
// const SENTENCE = "V + IV - III + 7 - II"
// const SENTENCE= "CIX + V"
// const SENTENCE = "CIX + V - 3 + VII - 2"
// const SENTENCE = "MMMCMXCIX - CXIX + MCXXII - MMMCDXII - XVIII - CCXXXV"
console.log(SENTENCE)

const AST_ROOT = Parser.parse(SENTENCE)

// Interpret recursively through the full AST starting from the root.
console.log((AST_ROOT as IAbstractExpression).interpret())

// Print out a representation of the AST_ROOT
console.dir(AST_ROOT, { depth: null })